Improvement in water-cocks



A. D. DAVIS y Water-Cocks I a vK6.

Patented`Nlov.17,1874.

me annum comubrmnnusam PARK momma f UNITED STATES PATENT OFFICE ALBERTD. DAVIS, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN'WATER-COCKS.

l Specification forming part of Letters Patent No. 156,987, datedNovember 17, 1674; application filed March 14, 1874.

To all whom it may concern:

Be it known that I, ALBERI` D. DAVIS, of Chicago, in the county of Cookand State of Illinois, have invented a new and useful Improvement inWater-Cocks; and I do declare that the following is a true and accuratedescription thereof, reference being had to the accompanying drawing,and to the letters of reference marked thereon, and being a part of thisspecification, which shows a vertical section ofthe water-cock.

'Ihe nature of this invention relates to an improvement in that classot' cocks whose valves are held closed by the pressure of the water inthe service-pipe.

The invention consists of a novel construction of the same by forming anairchamber in the body of the cock below the valve, in such a positionas to cushion the water-column, and avoid all pounding of the valve onthe valve-seat when the valve is closed by the pressure ofthe water.

In the drawing', A represents the air-chamber, whose mouth or opening isat a.- B is the rubber ball-valve, closing against the valve-seat b. Themouth a dips into the chamber A, so as to form an inverted vessel, fromwhich the 'air cannot escape when the month a is occupied and closed bythe water from the service-pipe; andwhen the flow of water through thecook is arrested by the closing of the valve B, the elasticity of theair confined in said chamber will cushion the watercolumn, and preventthe effect known as water-hammer.

Heretofore manufacturers have been unable to make a durable water-cockwhose valve closes with the pressure, for the reason that the water,when turned on full force and suddenly checked, produces a heavy thump,varying according to the pressure of water. This thumping not onlyinjures the cock itself, by speedily wearing out the valve, but also theplumbing throughout the building ismore or less shattered by thecontinual pounding produced by the water-pressure.

By the simple and inexpensive use of an air-chamber attached to theshell of the Watercock below the valve, to form a cushion for the waterto ram against, this objection is entirely avoided.

Having fully described the essential points of this invention, what Iclaim is- A Water-cock constructed with an air-chamber, A, situatedbelow the valve-seat, and within the shell thereof, substantially as setforth, in combination with a seat, b, and valve l B, arranged as setforth, to open against the water-pressure.

A. D. DAVIS.

Witnesses:

J. BEEVER, A I. B.W1G1IT.

